21380430402 has 24 divisors (see below), whose sum is σ = 46350670080. Its totient is φ = 7122747960.

The previous prime is 21380430397. The next prime is 21380430403. The reversal of 21380430402 is 20403408312.

21380430402 is a `hidden beast` number, since 213 + 8 + 0 + 43 + 0 + 402 = 666.

It is not an unprimeable number, because it can be changed into a prime (21380430403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 305974 + ... + 369297.

It is an arithmetic number, because the mean of its divisors is an integer number (1931277920).

Almost surely, 2^21380430402 is an apocalyptic number.

21380430402 is an abundant number, since it is smaller than the sum of its proper divisors (24970239678).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21380430402 is a wasteful number, since it uses less digits than its factorization.

21380430402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677038 (or 677035 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 21380430402 its reverse (20403408312), we get a palindrome (41783838714).

The spelling of 21380430402 in words is "twenty-one billion, three hundred eighty million, four hundred thirty thousand, four hundred two".